The International Workingmen's Association (the First International) was the first international body to bring together organisations representing the working class.[5] It was formed in London on 28 September 1864 by socialist, communist and anarchist political groups and trade unions.[6] Tensions between moderates and revolutionaries led to its dissolution in 1876 in Philadelphia.[7] The Second International was formed in Paris on 14 July 1889 as an association of the socialist parties.[8] Differences over World War I led to the Second International being dissolved in 1916.